Control module and ultrahigh pressure electric control needle valve system

Abstract

The utility model discloses a control module and an ultrahigh pressure electric control needle valve system, relates to the field of needle valve control, solves the problem that a reduction gearbox gear is seriously abraded after the reverse torsion of an output end is increased, and adopts the technical scheme that the control module comprises a current limiting circuit and a single chip microcomputer circuit; the single-chip microcomputer circuit comprises an STM32F0 single-chip microcomputer, a resistor R4, a capacitor C2 and a resistor R2. The NRST of the STM32F0 single-chip microcomputer forms an RC power-on reset circuit through a resistor R4 and a capacitor C2, and the resistor R2 controls the starting sequence of the STM32F0 single-chip microcomputer to be a built-in FLASH; the single-chip microcomputer circuit is connected with a current limiting circuit and used for controlling the current limiting circuit to output limiting current. The current limiting circuit is connected with the brushless direct current motor and used for limiting the maximum working current of the brushless direct current motor so as to control torque output of the brushless direct current motor and complete protection of the worm and gear reduction gearbox.

Description

Technical Field

[0001] This utility model relates to the field of needle valve control, and more specifically, it relates to a control module and an ultra-high pressure electrically controlled needle valve system. Background Technology

[0002] Brushless DC motors are characterized by high efficiency, low noise, and long lifespan. By adding a reduction gear at the output of the brushless motor, the reducer amplifies the motor's power while reducing its speed. Needle valves primarily control the flow rate of the medium by rotating the valve stem to raise or lower the valve core, thereby changing the gap between the valve core and the valve seat.

[0003] A brushless DC motor, a reduction gear, and a needle valve are combined to form an electronically controlled ultra-high pressure needle valve system. By controlling the forward / reverse rotation of the brushless DC motor and detecting its forward / reverse movement, the system determines whether the valve has been fully closed and its opening degree. Precise control of the valve's opening and closing is of great significance for high-pressure gas injection systems such as primary, secondary, and combustion cannons.

[0004] Currently, the increased reverse torque at the output end of the electronically controlled ultra-high pressure needle valve after passing through the reduction mechanism can lead to severe wear of the gearbox gears. When the wear reaches a certain level, it can easily cause the reduction mechanism to malfunction, thus affecting the entire needle valve system. Utility Model Content

[0005] The purpose of this invention is to provide a control module and an ultra-high pressure electrically controlled needle valve system, which solves the problem that the gearbox gears will wear severely after the reverse torque at the output end increases.

[0006] In a first aspect, this utility model provides a control module applied to an ultra-high pressure electrically controlled needle valve system, the ultra-high pressure electrically controlled needle valve system comprising a brushless DC motor, a worm gear reducer, a transmission bearing, and a needle valve connected in sequence; the control module includes a current limiting circuit and a microcontroller circuit.

[0007] The microcontroller circuit includes an STM32F0 microcontroller, resistor R4, capacitor C2, and resistor R2; the NRST of the STM32F0 microcontroller forms an RC power-on reset circuit via resistor R4 and capacitor C2, and resistor R2 controls the startup sequence of the STM32F0 microcontroller to be the built-in FLASH.

[0008] The microcontroller circuit is connected to the current limiting circuit and is used to control the current limiting circuit to output a current limiting current.

[0009] The current limiting circuit is connected to the brushless DC motor and is used to limit the maximum operating current of the brushless DC motor in order to control the torque output of the brushless DC motor and complete the protection of the worm gear reducer.

[0010] In one implementation, the current limiting circuit includes resistors R1 and R2, a current limiting chip U1, a PMOS transistor Q1, resistors R4 and R5, a transistor Q2, resistors R6 and R7, a current limiting chip U2, a PMOS transistor Q3, a resistor R8, and a resistor R9; wherein both current limiting chips U1 and U2 have input pins, output pins, and pins for setting the current limiting threshold.

[0011] The resistors R1, R2, and R6, the pin for setting the current limit threshold of the current limiting chip U1, and the pin for setting the current limit threshold of the current limiting chip U2 are respectively connected to the brushless DC motor. The resistors R1 and R2 are respectively connected to the output pin of the current limiting chip U1. The input pin of the current limiting chip U1 is connected to the drain of the PMOS transistor Q1. The collector of the transistor Q2 and the resistor R3 are respectively connected to the gate of the PMOS transistor Q1. The resistor R3 and the source of the PMOS transistor Q1 are connected to a 24V voltage.

[0012] One end of resistors R4 and R5 is connected to the PA7 pin of the STM32F0 microcontroller, the other end of resistor R4 is connected to the base of transistor Q2, and the other end of resistor R5 is connected to the emitter of transistor Q2 and then grounded.

[0013] The resistor R6 is connected to the output pin of the current limiting chip U2, the input pin of the current limiting chip U1 is connected to the drain of the PMOS transistor Q3, the source of the PMOS transistor Q3 is connected to a 24V voltage, one end of the resistor R7 is connected to the gate of the PMOS transistor Q3 and the collector of the transistor Q4, and the other end of the resistor R7 is connected to a 24V voltage. One end of the resistors R8 and R9 is connected to the PA6 pin of the STM32F0 microcontroller, the other end of the resistor R8 is connected to the base of the transistor Q4, and the other end of the resistor R9 is connected to the emitter of the transistor Q4 and then grounded.

[0014] In one implementation, the control module further includes an RS485 communication circuit; the RS485 communication circuit uses an SP3485 driver control chip, the output terminal of the SP3485 driver control chip is connected in series with a self-resetting fuse F1 and a self-resetting fuse F2, a diode D1 and a diode D3 respectively connected to the negative terminal of the power supply on the 485A and 485B signal lines of the SP3485 driver control chip, and a diode D2 connected in parallel between the 485A and 485B signal lines;

[0015] The EN485 pin, USART1-RX pin, and USART1-TX pin of the SP3485 driver control chip are respectively connected to the corresponding pins of the STM32F0 microcontroller.

[0016] In one implementation, the control module further includes a switching circuit for controlling the forward and reverse rotation of the brushless DC motor.

[0017] The switching circuit includes resistor R16, transistor Q6, resistor R21, and resistor R22;

[0018] One end of the resistor R16 is pulled up to a 5V level, and the other end is connected to the collector of the transistor Q6.

[0019] One end of resistors R21 and R22 is connected to the PA5 pin of the STM32F0 microcontroller.

[0020] The other end of resistor R21 is connected to the base of transistor Q6, and the other end of resistor R22 is connected to the emitter of transistor Q6 and then grounded.

[0021] In one implementation, the control module further includes a counter circuit for inputting a stable pulse signal to the microcontroller circuit.

[0022] In one implementation, the control module further includes a transformer circuit for stabilizing the output voltage of the microcontroller circuit at 3.3V.

[0023] In one implementation, the control module further includes an indicator light circuit for displaying the on / off status of the needle valve.

[0024] In one implementation, the control module further includes a button circuit for controlling the forward and reverse rotation of the brushless DC motor to control the on / off state of the needle valve.

[0025] In one implementation, the control module further includes a buzzer circuit for triggering an alarm when the pressure in the pipeline where the needle valve is located exceeds a threshold.

[0026] In a second aspect of the utility model, an ultra-high pressure electrically controlled needle valve system is provided, comprising a brushless DC motor, a worm gear reducer, a transmission bearing, and a needle valve, and a control module as provided in the first aspect of the invention, wherein the brushless DC motor, the worm gear reducer, the transmission bearing, and the needle valve are connected in sequence, and the control module is integrated on the brushless DC motor.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the control module and ultra-high pressure electrically controlled needle valve system provided by this utility model, the torque output of the brushless DC motor is limited by the current limiting protection function of the current limiting circuit, thereby protecting the gears of the worm gear reducer, avoiding wear of the gears of the worm gear reducer, and reducing the failure rate of the system. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 A schematic diagram of the structure of the ultra-high pressure electrically controlled needle valve system provided in this embodiment of the utility model;

[0031] Figure 2 A circuit diagram of the RS485 communication circuit provided for an embodiment of this utility model;

[0032] Figure 3 A circuit diagram of the switching circuit provided in an embodiment of this utility model;

[0033] Figure 4 A circuit diagram of a counter circuit provided for an embodiment of this utility model;

[0034] Figure 5 A circuit diagram of the current limiting circuit provided in an embodiment of this utility model;

[0035] Figure 6 A circuit diagram of a transformer circuit provided for an embodiment of this utility model;

[0036] Figure 7 A circuit diagram of the indicator light circuit provided in an embodiment of this utility model;

[0037] Figure 8 A circuit diagram of a microcontroller circuit provided for an embodiment of this utility model;

[0038] Figure 9 A circuit diagram of a button circuit provided for an embodiment of this utility model;

[0039] Figure 10 A circuit diagram of a buzzer circuit provided for an embodiment of this utility model.

[0040] The attached diagram shows the markings and corresponding component names:

[0041] 1. Control module; 2. Brushless DC motor; 3. Worm gear reducer; 4. Transmission bearing; 5. Needle valve. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0043] It should be noted that the terms "comprising" or "may include" used in the various embodiments of this application indicate the presence of the claimed function, operation, or element, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in the various embodiments of this application, the terms "comprising," "having," and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or adding one or more combinations of the foregoing.

[0044] In various embodiments of this application, the expression "or" or "at least one of B and / or C" includes any combination or all combinations of the words listed simultaneously. For example, the expression "B or C" or "at least one of B and / or C" may include B, may include C, or may include both B and C.

[0045] This embodiment provides a control module 1 applied to an ultra-high pressure electrically controlled needle valve 5 system. The ultra-high pressure electrically controlled needle valve 5 system includes a brushless DC motor 2, a worm gear reducer 3, a transmission bearing 4, and a needle valve 5 connected in sequence. The control module 1 includes a current limiting circuit and a microcontroller circuit. The microcontroller circuit includes an STM32F0 microcontroller, resistor R4, capacitor C2, and resistor R2. The NRST of the STM32F0 microcontroller forms an RC power-on reset circuit via resistor R4 and capacitor C2. Resistor R2 controls the startup sequence of the STM32F0 microcontroller to be the built-in FLASH. The microcontroller circuit is connected to the current limiting circuit to control the output current limit of the current limiting circuit. The current limiting circuit is connected to the brushless DC motor 2 to limit the maximum operating current of the brushless DC motor 2, thereby controlling the torque output of the brushless DC motor 2 and protecting the worm gear reducer 3.

[0046] In this embodiment, please refer to Figure 8 , Figure 8 This is a circuit diagram of the microcontroller circuit provided in this embodiment of the utility model. The microcontroller circuit is the core of the system. This embodiment uses an STM32F0 series microcontroller, which has a compact structure, powerful functions, a CM0 core, an operating frequency of up to 48MHz, and one USART and 11 GPIO ports. The microcontroller's NRST is connected to an RC power-on reset circuit via resistor R4 and capacitor C2. Resistor R2 controls the microcontroller's startup sequence to use the built-in FLASH memory.

[0047] Please refer to Figure 5 , Figure 5This is a circuit diagram of a current-limiting circuit provided in an embodiment of the present invention. The current-limiting circuit includes resistors R1 and R2, a current-limiting chip U1, a PMOS transistor Q1, resistors R4 and R5, a transistor Q2, resistors R6 and R7, a current-limiting chip U2, a PMOS transistor Q3, a current-limiting chip U2, a current-limiting chip Q3, a current-limiting chip U2, a current-limiting chip Q4, a current-limiting chip Q5, a current-limiting chip Q6, a current-limiting chip Q2, a current-limiting chip Q3, a current-limiting chip Q4, a current-limiting chip Q5, a current-limiting chip Q6, a current-limiting chip Q2, a current-limiting chip Q3, a current-limiting chip Q4, a current-limiting chip Q5, a current-limiting chip Q6, a current-limiting chip Q2, a current-limiting chip Q4, a current-limiting chip Q5, a current-limiting chip Q6, a current-limiting chip Q7, a current-limiting chip Q2, a current-limiting chip Q3 ...1, a current-limiting chip Q2 The source of resistor R3 and PMOS transistor Q1 is connected to a 24V voltage. One end of resistors R4 and R5 is connected to the PA7 pin of the STM32F0 microcontroller. The other end of resistor R4 is connected to the base of transistor Q2, and the other end of resistor R5 is connected to the emitter of transistor Q2 and then grounded. Resistor R6 is connected to the output pin of current limiting chip U2. The input pin of current limiting chip U1 is connected to the drain of PMOS transistor Q3, and the source of PMOS transistor Q3 is connected to a 24V voltage. One end of resistor R7 is connected to the gate of PMOS transistor Q3 and the collector of transistor Q4, and the other end of resistor R7 is connected to a 24V voltage. One end of resistors R8 and R9 is connected to the PA6 pin of the STM32F0 microcontroller. The other end of resistor R8 is connected to the base of transistor Q4, and the other end of resistor R9 is connected to the emitter of transistor Q4 and then grounded.

[0048] Specifically, Figure 5 The VM signal in the circuit is connected to the motor. Current limiting and torque output protection of the gearbox gears are achieved through the current-limiting resistor R1, based on Ohm's law. According to the function of this diagram, the maximum operating current of the motor is controlled by the current-limiting resistors R1 (R2 is redundant) / R6. Function: In this circuit, the microcontroller's PA7 pin outputs a high level, turning on transistor Q2 and creating a voltage difference between the gate and drain of PMOS transistor Q1, resulting in a 24V conduction voltage. The current-limiting chip U1 is a linearly adjustable voltage regulator. The voltage VM is directly connected to the motor. In this embodiment, this circuit is mainly used to control the brushless DC motor 2, and the current-limiting circuit is implemented through the circuit and resistors R1 and R2.

[0049] This circuit controls transistor Q2 via resistor R4 through port PA7 of the STM32F0 microcontroller. Resistor R5 acts as an anti-interference measure. Transistor Q2 controls the gate level of PMOS transistor Q1, thus stopping or starting the current limiting chip U1. The current limiting chip U1 outputs feedback current intensity through the parallel resistors R1 and R2.

[0050] Referring to Ohm's law I=1.25V / (R1 / / R2), and setting the resistances R1 and R2 to 2.2Ω, the calculated current I=1.25V / 1.1Ω≈1.14A, thus concluding that the current limit for the brushless DC motor in the two open directions is 1.14A.

[0051] The transistor Q4 is controlled via the PA6 port of the microcontroller and R8. R9 acts as an anti-interference device. The gate level of the MOSFET Q3 is controlled by the transistor Q4 to stop or start the current limiting chip U2. The output of U2 is fed back through the resistor R6.

[0052] Referring to Ohm's law I=1.25V / R6, and setting the resistor R6 to 2.2Ω, the calculated current I=1.25V / 2.2Ω≈0.57A, thus concluding that the current in the two off directions of the brushless DC motor is limited to 0.57A.

[0053] In some embodiments, the control module 1 further includes an RS485 communication circuit; the RS485 communication circuit uses an SP3485 driver control chip, the output terminal of the SP3485 driver control chip is connected in series with a self-resetting fuse F1 and a self-resetting fuse F2, a diode D1 and a diode D3 connected to the negative terminal of the power supply are respectively connected on the 485A and 485B signal lines of the SP3485 driver control chip, and a diode D2 is connected in parallel between the 485A and 485B signal lines; wherein, the EN485 pin, USART1-RX pin, and USART1-TX pin of the SP3485 driver control chip are respectively connected to the corresponding pins of the STM32F0 microcontroller.

[0054] Specifically, such as Figure 2 As shown, the RS485 communication circuit uses the SP3485 driver control chip. The output terminal is connected in series with self-resetting fuses F1 and F2. A TVS diode D1 and D3 connected to the negative terminal of the power supply are connected on the 485A and 485B signal lines respectively. At the same time, a TVS diode D2 is connected in parallel between the 485A and 485B signal lines. This circuit has a protection function for the RS485 communication circuit.

[0055] In some embodiments, the control module 1 further includes a switching circuit for controlling the forward and reverse rotation of the brushless DC motor 2; the switching circuit includes a resistor R16, a transistor Q6, a resistor R21, and a resistor R22; one end of the resistor R16 is pulled up to a 5V level, and the other end is connected to the collector of the transistor Q6.

[0056] One end of resistors R21 and R22 is connected to the PA5 pin of the STM32F0 microcontroller; the other end of resistor R21 is connected to the base of transistor Q6, and the other end of resistor R22 is connected to the emitter of transistor Q6 and then grounded.

[0057] Specifically, such as Figure 3 As shown, the switching circuit is used to control the forward and reverse rotation of the brushless DC motor 2. This circuit limits the current of the control signal through resistor R21, and performs anti-interference design on the control signal through resistor R22. By pulling up the 5V level through resistor R16, the driving capability of the direction control signal can be effectively guaranteed. Transistor Q6 is used to receive the control signal output by the microcontroller circuit and amplify the voltage level of the control signal to protect the microcontroller control port from being affected by external loads.

[0058] In some embodiments, the control module 1 further includes a counter circuit for inputting a stable pulse signal to the microcontroller circuit.

[0059] Specifically, such as Figure 4 As shown, the counter circuit is used to control the switching of transistor Q7 when the pulse signal of the brushless DC motor 2 rotates passes through resistor R24, so that the PA4 pin of the STM32F0 microcontroller generates a high or low level. This level is connected to 3.3V by resistor R25 and is filtered by capacitor C7 to ensure that the input pulse signal is stably transmitted to the inside of the STM32F0 microcontroller.

[0060] In some embodiments, the control module 1 further includes a transformer circuit for stabilizing the output voltage of the microcontroller circuit at 3.3V.

[0061] Specifically, such as Figure 6As shown, the internal voltages of the needle valve 5 system provided in this embodiment are 24V, 5V, and 3.3V. A unidirectional TVS diode D4 is connected to ground at the 24V input terminal, and the F3 resettable fuse provides hot-swap and surge protection for this system. The SSP9459 is a DC-DC switching power supply step-down chip. A capacitor C5 is connected in parallel at the chip input terminal for power supply regulation and filtering. SW is the control terminal, which enables L1 to store energy through a switch. Schottky diode D5 is used for power discharge. C6 bypasses the BST control terminal. FB provides a 0.812V feedback voltage signal to the system. The output voltage of C9 can be stabilized at 5V by adjusting R18 and R23. Although the SSP9459 power supply output ripple noise is already relatively small, considering that the microcontroller requires a more precise 3.3V operating voltage, this embodiment uses the H7533 linear voltage regulator chip to further reduce the 5V voltage to 3.3V, making the microcontroller power supply voltage more stable. Capacitors C11 and C12 provide filtering for the input and output of U5, respectively.

[0062] In some embodiments, the control module 1 further includes an indicator light circuit for displaying the on / off status of the needle valve 5.

[0063] Specifically, such as Figure 7 As shown, the indicator light circuit is used to provide more intuitive feedback on the system control status. Due to the harsh operating environment of the equipment, the valve opening and closing status is often difficult to see in dim light. The indicator lights effectively solve this problem. The three status indicator lights are connected to the 3.3V power supply through current-limiting resistors R10, R14, and R15, respectively. The cathodes of LED2, LED3, and LED4 are connected to the control port of the microcontroller.

[0064] In some embodiments, the control module 1 further includes a button circuit for controlling the forward and reverse rotation of the brushless DC motor 2 to control the on / off state of the needle valve 5.

[0065] Specifically, such as Figure 9 As shown, the button circuit is used to control the forward and reverse rotation of the brushless DC motor 2 (and the opening and closing of the needle valve 5). The tactile button switch used in this system is designed with the button height flush with the edge of the fastening structure. This prevents accidental external triggering of the button while ensuring that the operator can clearly see the button and operate the valve. The button is also pulled up to 3.3V via resistors R26 and R27, and pulled down to ground via capacitors C10 and C8, forming an RC filter circuit to prevent interference from causing malfunctions in the microcontroller program.

[0066] In some embodiments, the control module 1 further includes a buzzer circuit for alarming when the pressure in the pipeline where the needle valve 5 is located exceeds a threshold.

[0067] Specifically, such as Figure 10As shown, due to the extreme danger of ultra-high pressure electric valves during opening and closing, and the fact that the pressure in the pipelines where the valves are located often exceeds 200MPa, remote control is necessary except during local installation and commissioning. In these situations, sound serves as a hazard warning. A buzzer is the simplest sound-generating device. The system uses resistor R19 to control the transistor Q5 switch, which in turn controls the flow of BUZZER1 through the current-limiting resistor R12 to a 5V power supply, thus producing a sharp, piercing buzzer alarm sound.

[0068] It should be noted that the control module 1 provided in this embodiment is integrated into the brushless DC motor 2, therefore Figures 2-10 The pins of the circuits involved are all connected to the corresponding pins of the microcontroller as inputs and outputs. This is common knowledge to those skilled in the art, and this embodiment will not repeat the details. Secondly, regarding Figures 2-10 The parameter values ​​for each circuit component can be found by referring to... Figures 2-10 The settings for the selected items will not be repeated in this embodiment.

[0069] like Figure 1 As shown, this embodiment provides an ultra-high pressure electrically controlled needle valve 5 system, including a brushless DC motor 2, a worm gear reducer 3, a transmission bearing 4, and a needle valve 5, and a control module 1 as provided in the first aspect of the present invention, wherein the brushless DC motor 2, the worm gear reducer 3, the transmission bearing 4, and the needle valve 5 are connected in sequence, and the control module 1 is integrated on the brushless DC motor 2.

[0070] In the ultra-high pressure electrically controlled needle valve 5 system provided by the present invention, the current limiting protection function of the current limiting circuit of the control module 1 limits the torque output of the brushless DC motor 2, thereby protecting the gears of the worm gear reducer 3, avoiding wear of the gears of the worm gear reducer 3, and reducing the failure rate of the system.

[0071] In the ultra-high pressure electrically controlled needle valve system provided by this invention, the current limiting protection function of the current limiting circuit of the control module limits the torque output of the brushless DC motor, thereby protecting the gears of the worm gear reducer, avoiding wear of the gears of the worm gear reducer, and reducing the failure rate of the system.

[0072] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A control module applied to an ultra-high pressure electrically controlled needle valve system, the ultra-high pressure electrically controlled needle valve system comprising a brushless DC motor, a worm gear reducer, a transmission bearing, and a needle valve connected in sequence; characterized in that, The control module includes a current limiting circuit and a microcontroller circuit. The microcontroller circuit includes an STM32F0 microcontroller, resistor R4, capacitor C2, and resistor R2; the NRST of the STM32F0 microcontroller forms an RC power-on reset circuit via resistor R4 and capacitor C2, and resistor R2 controls the startup sequence of the STM32F0 microcontroller to be the built-in FLASH. The microcontroller circuit is connected to the current limiting circuit and is used to control the current limiting circuit to output a current limiting current. The current limiting circuit is connected to the brushless DC motor and is used to limit the maximum operating current of the brushless DC motor in order to control the torque output of the brushless DC motor and complete the protection of the worm gear reducer.

2. The control module according to claim 1, characterized in that, The current limiting circuit includes resistors R1 and R2, current limiting chip U1, PMOS transistor Q1, resistors R4 and R5, transistor Q2, resistor R6, current limiting chip U2, PMOS transistor Q3, resistors R7, R8, and R9; wherein, current limiting chip U1 and current limiting chip U2 each have an input pin, an output pin, and a pin for setting the current limiting threshold. The resistors R1, R2, and R6, the pin for setting the current limit threshold of the current limiting chip U1, and the pin for setting the current limit threshold of the current limiting chip U2 are respectively connected to the brushless DC motor. The resistors R1 and R2 are respectively connected to the output pin of the current limiting chip U1. The input pin of the current limiting chip U1 is connected to the drain of the PMOS transistor Q1. The collector of the transistor Q2 and the resistor R3 are respectively connected to the gate of the PMOS transistor Q1. The resistor R3 and the source of the PMOS transistor Q1 are connected to a 24V voltage. One end of resistors R4 and R5 is connected to the PA7 pin of the STM32F0 microcontroller, the other end of resistor R4 is connected to the base of transistor Q2, and the other end of resistor R5 is connected to the emitter of transistor Q2 and then grounded. The resistor R6 is connected to the output pin of the current limiting chip U2, the input pin of the current limiting chip U1 is connected to the drain of the PMOS transistor Q3, the source of the PMOS transistor Q3 is connected to a 24V voltage, one end of the resistor R7 is connected to the gate of the PMOS transistor Q3 and the collector of the transistor Q4, and the other end of the resistor R7 is connected to a 24V voltage. One end of the resistors R8 and R9 is connected to the PA6 pin of the STM32F0 microcontroller, the other end of the resistor R8 is connected to the base of the transistor Q4, and the other end of the resistor R9 is connected to the emitter of the transistor Q4 and then grounded.

3. The control module according to claim 1, characterized in that, The control module also includes an RS485 communication circuit; the RS485 communication circuit uses an SP3485 driver control chip, and the output terminal of the SP3485 driver control chip is connected in series with a self-resetting fuse F1 and a self-resetting fuse F2. A diode D1 and a diode D3, which are respectively connected to the negative terminal of the power supply, are connected on the 485A and 485B signal lines of the SP3485 driver control chip, and a diode D2 is connected in parallel between the 485A and 485B signal lines. The EN485 pin, USART1-RX pin, and USART1-TX pin of the SP3485 driver control chip are respectively connected to the corresponding pins of the STM32F0 microcontroller.

4. A control module according to claim 1, characterized in that, The control module also includes a switching circuit, which is used to control the forward and reverse rotation of the brushless DC motor. The switching circuit includes resistor R16, transistor Q6, resistor R21, and resistor R22; One end of the resistor R16 is pulled up to a 5V level, and the other end is connected to the collector of the transistor Q6. One end of resistors R21 and R22 is connected to the PA5 pin of the STM32F0 microcontroller. The other end of resistor R21 is connected to the base of transistor Q6, and the other end of resistor R22 is connected to the emitter of transistor Q6 and then grounded.

5. A control module according to claim 1, characterized in that, The control module also includes a counter circuit for inputting stable pulse signals to the microcontroller circuit.

6. A control module according to claim 1, characterized in that, The control module also includes a transformer circuit, which is used to stabilize the output voltage of the microcontroller circuit at 3.3V.

7. A control module according to claim 1, characterized in that, The control module also includes an indicator light circuit for displaying the on / off status of the needle valve.

8. A control module according to claim 1, characterized in that, The control module also includes a button circuit for controlling the forward and reverse rotation of the brushless DC motor, thereby controlling the on / off state of the needle valve.

9. A control module according to claim 1, characterized in that, The control module also includes a buzzer circuit, which is used to sound an alarm when the pressure in the pipeline where the needle valve is located exceeds a threshold.

10. A high-pressure electrically controlled needle valve system, characterized in that, The device includes a brushless DC motor, a worm gear reducer, a transmission bearing, and a needle valve, and a control module as described in any one of claims 1 to 9, wherein the brushless DC motor, the worm gear reducer, the transmission bearing, and the needle valve are connected in sequence, and the control module is integrated on the brushless DC motor.

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